Add nostrlib to agents stuff

.agents/skills/e2e-chapter/SKILL.md

@@ -0,0 +1,7 @@
+Refer to @book/SUMMARY.md for a table of contents. Find a chapter that has not yet been written, then execute your /research-chapter, /plan-chapter, and /write-chapter skills for the chapter.
+
+Validation after this process is complete:
+
+- Make sure the chapter is concise, correct, and makes sense in context of the book
+- Add tests to the tests directory
+- Make sure that the project compiles and the tests complete

.agents/skills/plan-chapter/SKILL.md

@@ -33,8 +33,6 @@ Draw on the research to make your questions specific and informed. Areas to expl
   introduced? What prior knowledge can we assume from earlier chapters?
 - **Code Organization**: Which crate(s) should this code live in? How should modules be
   structured?
-- **Teaching Approach**: Are there concepts that need careful explanation? Diagrams?
-  Worked examples?
 
 Ask questions in batches of 2-3 at a time. After each round of answers, follow up on
 anything that needs clarification before moving on. Continue until you have enough detail

.agents/skills/research-chapter/SKILL.md

@@ -40,10 +40,11 @@ Each sub-agent should:
 3. Return a detailed summary focusing **only on functionality relevant to the chapter topic**
    — ignore unrelated parts of the library
 
-The six code reference implementations to analyze:
+The seven code reference implementations to analyze:
 - `ref/applesauce` (TypeScript — noStrudel ecosystem)
 - `ref/ndk` (TypeScript — Nostr Development Kit)
 - `ref/nostr-gadgets` (TypeScript — high-level utilities, JSR)
+- `ref/nostrlib` (Go — fiatjaf's comprehensive Go library)
 - `ref/nostr-tools` (TypeScript — low-level tools, minimal deps)
 - `ref/rust-nostr` (Rust — full implementation, multiple crates)
 - `ref/welshman` (TypeScript — extracted from Coracle client)
@@ -77,6 +78,9 @@ The research file should have this structure:
 ### nostr-gadgets
 <detailed findings>
 
+### nostrlib
+<detailed findings>
+
 ### nostr-tools
 <detailed findings>